package facade;

/**
 * @author shenhan
 * @create 2020/4/3 16:18
 * @description
 */
public class Projector {
    private static Projector instance = new Projector();

    public static Projector getInstance() {
        return instance;
    }

    public void on() {
        System.out.println("投影仪 打开");
    }

    public void close() {
        System.out.println("投影仪 关闭");
    }

    public void focus() {
        System.out.println("投影仪 聚焦");
    }

}
